Study |
Year of publication |
Sample size |
Case selection quality |
Validity of methodology |
Statistical analysis adequacy |
Confounding variables adequately addressed |
Results reporting |
Judged quality |
---|---|---|---|---|---|---|---|---|
Ritz et al. [12] | 2002 | + | - | + | + | + | + | High |
Chung et al. [17] | 2012 | - | + | - | + | - | - | Low |
Dolk et al. [18] | 2010 | + | + | + | + | - | + | High |
Gilboa et al. [19] | 2005 | + | + | + | + | + | + | High |
Hansen et al. [20] | 2009 | - | - | + | + | - | + | Medium |
Hwang et al. [21] | 2008 | + | - | + | + | + | + | High |
Marshall et al. [22] | 2010 | + | + | + | + | - | + | High |
Rankin et al. [23] | 2009 | - | + | + | + | + | + | High |